Added support for more affinity kind.

"affinity('depend | numa | core', 'expr1'[, 'expr2'])"

'expr1' is the affinity requested.
'expr2' defines if the affinity is "strict" (0 by default, anything but 0 means strict).

Using 'depend' will set the affinity of the task to the numa node where 'expr1' is located (therefore, a pointer is expected).